A Northern California district attorney's office is stepping up security after someone threw a Molotov cocktail through a window.

The Record Searchlight of Redding reports that firefighters and police responded around 3 a.m. Tuesday to the Shasta County district attorney's office in Redding. Someone had apparently broken a window and thrown a Molotov cocktail inside.

Redding fire investigator Craig Wittner says the ensuing fire was put out by an automatic sprinkler system. He estimated the damage to the office at $15,000 and said there could have been injuries if somebody had been there at the time.

Assistant District Attorney Josh Lowery said he was not aware of any recent threats. He said the office had implemented internal security precautions, though he would not say what they were.